Jefferson County's estimated 2026 population is 36,044 with a growth rate of 1.68% in the past year according to the most recent United States census data. Jefferson County is the 12th largest county in Idaho. The 2010 population was 26,222 and has seen a growth of 37.46% since that time.
Data after 2023 is projected based on recent change
The racial composition of Jefferson County includes 88.29% White, 4.44% other race, and smaller percentages for Native American, Black or African American, Asian, Native Hawaiian or Pacific Islander and multiracial populations.
White (88.29%)
Two or more races (6.45%)
Other race (4.44%)
Native American (0.61%)
Black or African American (0.12%)
Asian (0.07%)
Native Hawaiian or Pacific Islander (0.02%)
Race | Population | Percentage (of total) |
|---|---|---|
| White | 28,459 | 88.29% |
| Two or more races | 2,080 | 6.45% |
| Other race | 1,432 | 4.44% |
| Native American | 197 | 0.61% |
| Black or African American | 40 | 0.12% |
| Asian | 21 | 0.07% |
| Native Hawaiian or Pacific Islander | 5 | 0.02% |
Married
Widowed
Divorced
Separated
Never Married
Jefferson County's average per capita income is $46,155. Household income levels show a median of $82,952. The poverty rate stands at 9.24%.
Name | Median | Mean |
|---|---|---|
| Married Families | $94,333 | - |
| Families | $89,672 | $103,571 |
| Households | $82,952 | $95,822 |
| Non Families | $40,318 | $57,101 |
Average Income
Median Household Income
Poverty Rate
